Mechanical Properties of GIC Modified with N-vinylpyrrolidone, Nano-hydroxy and Fluoroapatite
Objectives: The objective of this study was to enhance the mechanical strength of glass ionomer cements, while preserving their unique clinical properties. Methods: In this study N-vinyl pyrrolidone containing polymers with new monomeric orders and different molar ratios were synthesised. The synthesised polymer was a copolymer of acrylic acid and NVP with side chains containing itaconic acid. In addition, nano-hydroxy and fluoroapatite were synthesised using an ethanol based sol-gel technique. Polymers synthesised were used to formulate glass ionomer cements (Fuji II commercial GIC) and nano-ceramic particles obtained from sol-gel technique were incorporated into conventional glass ionomer powder (Fuji II). The synthesised materials were characterised using FTIR and Raman spectroscopy and SEM. The molecular weights and viscosity of the synthesised polymers were measured in this study in order to compare with the values of the commercial Fuji II glass. Compressive, diametral tensile and biaxial flexural strengths of the modified glass ionomer cements were evaluated. Results: Results showed that NVP modified glass ionomer cements exhibited higher compressive strength (163-167 MPa), higher diametral tensile strength (13-17 MPa) and much higher biaxial flexural strength (26-29 MPa) in comparison to commercial Fuji II GIC (160 MPa in CS, 12 MPa in DTS and 14 MPa in biaxial flexural strength). The HAp/ FA added cements also exhibited higher CS (177-179 MPa), higher DTS (19-20MPa) and much higher biaxial flexural strength (29-30 MPa) as compared to control group (Fuji II). The highest values for CS, DTS and BFS were found for NVP-nanoceramic powder modified cements (184 MPa for CS, 24 MPa for DTS and 35 MPa for BFS) which were statistically higher than control group. Conclusion: It was concluded that, both NVP modified and nano-HA/FA added glass ionomer cements are promising restorative dental materials with improved mechanical properties.
Division: British and Scandinavian Divisions Meeting
Meeting:2007 British and Scandinavian Divisions Meeting (Durham, England) Location: Durham, England
Year: 2007 Final Presentation ID:145 Abstract Category|Abstract Category(s):Dental Materials
Authors
Moshaverinia, Alireza
( Queen Mary University of London,IRC in Biomedical Materials, London, N/A, United Kingdom
)
Ansari, Sahar
( Queen Mary University of London,IRC in Biomedical Materials, London, N/A, United Kingdom
)
Movasaghi, Zanyar
( Queen Mary University of London,IRC in Biomedical Materials, London, N/A, United Kingdom
)
Billington, Richard W.
( Biomaterial in Relation to Dentistry Department, Queen Mary University of London, London, N/A, United Kingdom
)
Darr, Jawwad
( Queen Mary University of London,IRC in Biomedical Materials, London, N/A, United Kingdom
)
Rehman, Ihtesham Ur
( Queen Mary University of London,IRC in Biomedical Materials, London, N/A, United Kingdom
)
SESSION INFORMATION
Poster Session
Dental Materials posters I
04/04/2007